Support Inputs in pipeline config, hashes are per task

[gsoltis]

• Add support for "inputs": [<file glob>] to pipeline config
• In the case of "inputs", use git ls-files to calculate file hashes
• Remove package-level hash and file hash
• Hash combinations of package-inputs
• Hashing of package-tasks is now done inline while walking the graph
• Update e2e test to highlight new hashing behavior

Because task hashing now only takes into account the hash of task-graph dependencies, tasks that don't have task-graph dependencies won't have new hashes when package-dependencies change. The classic example is lint. If a depends on b, and b changes, that should no longer force a cache miss for a#lint, so long as the lint task has no dependencies.

Remaining work:

• Update fallback for git ls-file to properly handle inputs
• Add tests for inputs
• Update global hash key (not technically necessary, but may be a good idea)

Fixes #523

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[jaredpalmer]

lgtm

[ObliviousHarmony]

This is a very exciting change. One thing I wanted to note is that this should likely also be documented as a configuration option.

[gsoltis]

@ObliviousHarmony docs coming in #1046